cfg80211: implement wext key handling

Move key handling wireless extension ioctls from mac80211 to cfg80211
so that all drivers that implement the cfg80211 operations get wext
compatibility.

Note that this drops the SIOCGIWENCODE ioctl support for getting
IW_ENCODE_RESTRICTED/IW_ENCODE_OPEN. This means that iwconfig will
no longer report "Security mode:open" or "Security mode:restricted"
for mac80211. However, what we displayed there (the authentication
algo used) was actually wrong -- linux/wireless.h states that this
setting is meant to differentiate between "Refuse non-encoded packets"
and "Accept non-encoded packets".

(Combined with "cfg80211: fix a couple of bugs with key ioctls". -- JWL)

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

7 files changed, 343 insertions, 317 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 4c748935ce5f..e69e6c66dd16 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1150,6 +1150,7 @@ struct wireless_dev {
 	struct {
 		struct cfg80211_ibss_params ibss;
 		u8 bssid[ETH_ALEN];
+		s8 default_key, default_mgmt_key;
 	} wext;
 #endif
 };
@@ -1400,6 +1401,15 @@ int cfg80211_wext_siwretry(struct net_device *dev,
 int cfg80211_wext_giwretry(struct net_device *dev,
 			   struct iw_request_info *info,
 			   struct iw_param *retry, char *extra);
+int cfg80211_wext_siwencodeext(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_point *erq, char *extra);
+int cfg80211_wext_siwencode(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct iw_point *erq, char *keybuf);
+int cfg80211_wext_giwencode(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct iw_point *erq, char *keybuf);
 
 /*
  * callbacks for asynchronous cfg80211 methods, notification
diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c
index 6b4eb8d43a4e..d84502644686 100644
--- a/net/mac80211/wext.c
+++ b/net/mac80211/wext.c
@@ -27,100 +27,6 @@
 #include "aes_ccm.h"
 
 
-static int ieee80211_set_encryption(struct ieee80211_sub_if_data *sdata, u8 *sta_addr,
-				    int idx, int alg, int remove,
-				    int set_tx_key, const u8 *_key,
-				    size_t key_len)
-{
-	struct ieee80211_local *local = sdata->local;
-	struct sta_info *sta;
-	struct ieee80211_key *key;
-	int err;
-
-	if (alg == ALG_AES_CMAC) {
-		if (idx < NUM_DEFAULT_KEYS ||
-		    idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) {
-			printk(KERN_DEBUG "%s: set_encrypt - invalid idx=%d "
-			       "(BIP)\n", sdata->dev->name, idx);
-			return -EINVAL;
-		}
-	} else if (idx < 0 || idx >= NUM_DEFAULT_KEYS) {
-		printk(KERN_DEBUG "%s: set_encrypt - invalid idx=%d\n",
-		       sdata->dev->name, idx);
-		return -EINVAL;
-	}
-
-	if (remove) {
-		rcu_read_lock();
-
-		err = 0;
-
-		if (is_broadcast_ether_addr(sta_addr)) {
-			key = sdata->keys[idx];
-		} else {
-			sta = sta_info_get(local, sta_addr);
-			if (!sta) {
-				err = -ENOENT;
-				goto out_unlock;
-			}
-			key = sta->key;
-		}
-
-		ieee80211_key_free(key);
-	} else {
-		key = ieee80211_key_alloc(alg, idx, key_len, _key);
-		if (!key)
-			return -ENOMEM;
-
-		sta = NULL;
-		err = 0;
-
-		rcu_read_lock();
-
-		if (!is_broadcast_ether_addr(sta_addr)) {
-			set_tx_key = 0;
-			/*
-			 * According to the standard, the key index of a
-			 * pairwise key must be zero. However, some AP are
-			 * broken when it comes to WEP key indices, so we
-			 * work around this.
-			 */
-			if (idx != 0 && alg != ALG_WEP) {
-				ieee80211_key_free(key);
-				err = -EINVAL;
-				goto out_unlock;
-			}
-
-			sta = sta_info_get(local, sta_addr);
-			if (!sta) {
-				ieee80211_key_free(key);
-				err = -ENOENT;
-				goto out_unlock;
-			}
-		}
-
-		if (alg == ALG_WEP &&
-			key_len != LEN_WEP40 && key_len != LEN_WEP104) {
-			ieee80211_key_free(key);
-			err = -EINVAL;
-			goto out_unlock;
-		}
-
-		ieee80211_key_link(key, sdata, sta);
-
-		if (set_tx_key || (!sta && !sdata->default_key && key))
-			ieee80211_set_default_key(sdata, idx);
-		if (alg == ALG_AES_CMAC &&
-		    (set_tx_key || (!sta && !sdata->default_mgmt_key && key)))
-			ieee80211_set_default_mgmt_key(sdata, idx);
-	}
-
- out_unlock:
-	rcu_read_unlock();
-
-	return err;
-}
-
 static int ieee80211_ioctl_siwgenie(struct net_device *dev,
 				    struct iw_request_info *info,
 				    struct iw_point *data, char *extra)
@@ -472,109 +378,6 @@ static int ieee80211_ioctl_giwtxpower(struct net_device *dev,
 	return 0;
 }
 
-static int ieee80211_ioctl_siwencode(struct net_device *dev,
-				     struct iw_request_info *info,
-				     struct iw_point *erq, char *keybuf)
-{
-	struct ieee80211_sub_if_data *sdata;
-	int idx, i, alg = ALG_WEP;
-	u8 bcaddr[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
-	int remove = 0, ret;
-
-	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-
-	idx = erq->flags & IW_ENCODE_INDEX;
-	if (idx == 0) {
-		if (sdata->default_key)
-			for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
-				if (sdata->default_key == sdata->keys[i]) {
-					idx = i;
-					break;
-				}
-			}
-	} else if (idx < 1 || idx > 4)
-		return -EINVAL;
-	else
-		idx--;
-
-	if (erq->flags & IW_ENCODE_DISABLED)
-		remove = 1;
-	else if (erq->length == 0) {
-		/* No key data - just set the default TX key index */
-		ieee80211_set_default_key(sdata, idx);
-		return 0;
-	}
-
-	ret = ieee80211_set_encryption(
-		sdata, bcaddr,
-		idx, alg, remove,
-		!sdata->default_key,
-		keybuf, erq->length);
-
-	if (!ret && sdata->vif.type == NL80211_IFTYPE_STATION) {
-		if (remove)
-			sdata->u.mgd.flags &= ~IEEE80211_STA_TKIP_WEP_USED;
-		else
-			sdata->u.mgd.flags |= IEEE80211_STA_TKIP_WEP_USED;
-	}
-
-	return ret;
-}
-
-
-static int ieee80211_ioctl_giwencode(struct net_device *dev,
-				     struct iw_request_info *info,
-				     struct iw_point *erq, char *key)
-{
-	struct ieee80211_sub_if_data *sdata;
-	int idx, i;
-
-	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-
-	idx = erq->flags & IW_ENCODE_INDEX;
-	if (idx < 1 || idx > 4) {
-		idx = -1;
-		if (!sdata->default_key)
-			idx = 0;
-		else for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
-			if (sdata->default_key == sdata->keys[i]) {
-				idx = i;
-				break;
-			}
-		}
-		if (idx < 0)
-			return -EINVAL;
-	} else
-		idx--;
-
-	erq->flags = idx + 1;
-
-	if (!sdata->keys[idx]) {
-		erq->length = 0;
-		erq->flags |= IW_ENCODE_DISABLED;
-		return 0;
-	}
-
-	memcpy(key, sdata->keys[idx]->conf.key,
-	       min_t(int, erq->length, sdata->keys[idx]->conf.keylen));
-	erq->length = sdata->keys[idx]->conf.keylen;
-	erq->flags |= IW_ENCODE_ENABLED;
-
-	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
-		switch (sdata->u.mgd.auth_alg) {
-		case WLAN_AUTH_OPEN:
-		case WLAN_AUTH_LEAP:
-			erq->flags |= IW_ENCODE_OPEN;
-			break;
-		case WLAN_AUTH_SHARED_KEY:
-			erq->flags |= IW_ENCODE_RESTRICTED;
-			break;
-		}
-	}
-
-	return 0;
-}
-
 static int ieee80211_ioctl_siwpower(struct net_device *dev,
 				    struct iw_request_info *info,
 				    struct iw_param *wrq,
@@ -809,82 +612,6 @@ static int ieee80211_ioctl_giwauth(struct net_device *dev,
 }
 
 
-static int ieee80211_ioctl_siwencodeext(struct net_device *dev,
-					struct iw_request_info *info,
-					struct iw_point *erq, char *extra)
-{
-	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-	struct iw_encode_ext *ext = (struct iw_encode_ext *) extra;
-	int uninitialized_var(alg), idx, i, remove = 0;
-
-	switch (ext->alg) {
-	case IW_ENCODE_ALG_NONE:
-		remove = 1;
-		break;
-	case IW_ENCODE_ALG_WEP:
-		alg = ALG_WEP;
-		break;
-	case IW_ENCODE_ALG_TKIP:
-		alg = ALG_TKIP;
-		break;
-	case IW_ENCODE_ALG_CCMP:
-		alg = ALG_CCMP;
-		break;
-	case IW_ENCODE_ALG_AES_CMAC:
-		alg = ALG_AES_CMAC;
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	if (erq->flags & IW_ENCODE_DISABLED)
-		remove = 1;
-
-	idx = erq->flags & IW_ENCODE_INDEX;
-	if (alg == ALG_AES_CMAC) {
-		if (idx < NUM_DEFAULT_KEYS + 1 ||
-		    idx > NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) {
-			idx = -1;
-			if (!sdata->default_mgmt_key)
-				idx = 0;
-			else for (i = NUM_DEFAULT_KEYS;
-				  i < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
-				  i++) {
-				if (sdata->default_mgmt_key == sdata->keys[i])
-				{
-					idx = i;
-					break;
-				}
-			}
-			if (idx < 0)
-				return -EINVAL;
-		} else
-			idx--;
-	} else {
-		if (idx < 1 || idx > 4) {
-			idx = -1;
-			if (!sdata->default_key)
-				idx = 0;
-			else for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
-				if (sdata->default_key == sdata->keys[i]) {
-					idx = i;
-					break;
-				}
-			}
-			if (idx < 0)
-				return -EINVAL;
-		} else
-			idx--;
-	}
-
-	return ieee80211_set_encryption(sdata, ext->addr.sa_data, idx, alg,
-					remove,
-					ext->ext_flags &
-					IW_ENCODE_EXT_SET_TX_KEY,
-					ext->key, ext->key_len);
-}
-
-
 /* Structures to export the Wireless Handlers */
 
 static const iw_handler ieee80211_handler[] =
@@ -931,8 +658,8 @@ static const iw_handler ieee80211_handler[] =
 	(iw_handler) ieee80211_ioctl_giwtxpower,	/* SIOCGIWTXPOW */
 	(iw_handler) cfg80211_wext_siwretry,		/* SIOCSIWRETRY */
 	(iw_handler) cfg80211_wext_giwretry,		/* SIOCGIWRETRY */
-	(iw_handler) ieee80211_ioctl_siwencode,		/* SIOCSIWENCODE */
-	(iw_handler) ieee80211_ioctl_giwencode,		/* SIOCGIWENCODE */
+	(iw_handler) cfg80211_wext_siwencode,		/* SIOCSIWENCODE */
+	(iw_handler) cfg80211_wext_giwencode,		/* SIOCGIWENCODE */
 	(iw_handler) ieee80211_ioctl_siwpower,		/* SIOCSIWPOWER */
 	(iw_handler) ieee80211_ioctl_giwpower,		/* SIOCGIWPOWER */
 	(iw_handler) NULL,				/* -- hole -- */
@@ -941,7 +668,7 @@ static const iw_handler ieee80211_handler[] =
 	(iw_handler) NULL,				/* SIOCGIWGENIE */
 	(iw_handler) ieee80211_ioctl_siwauth,		/* SIOCSIWAUTH */
 	(iw_handler) ieee80211_ioctl_giwauth,		/* SIOCGIWAUTH */
-	(iw_handler) ieee80211_ioctl_siwencodeext,	/* SIOCSIWENCODEEXT */
+	(iw_handler) cfg80211_wext_siwencodeext,	/* SIOCSIWENCODEEXT */
 	(iw_handler) NULL,				/* SIOCGIWENCODEEXT */
 	(iw_handler) NULL,				/* SIOCSIWPMKSA */
 	(iw_handler) NULL,				/* -- hole -- */
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 15b2a1794805..47c20eb0c04d 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -1,7 +1,7 @@
 /*
  * This is the linux wireless configuration interface.
  *
- * Copyright 2006-2008		Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2006-2009		Johannes Berg <johannes@sipsolutions.net>
  */
 
 #include <linux/if.h>
@@ -457,6 +457,10 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
 				"symlink to netdev!\n");
 		}
 		dev->ieee80211_ptr->netdev = dev;
+#ifdef CONFIG_WIRELESS_EXT
+		dev->ieee80211_ptr->wext.default_key = -1;
+		dev->ieee80211_ptr->wext.default_mgmt_key = -1;
+#endif
 		mutex_unlock(&rdev->devlist_mtx);
 		break;
 	case NETDEV_GOING_DOWN:
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 3e49d3399311..f14b6c5f4221 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -1,7 +1,7 @@
 /*
  * Wireless configuration interface internals.
  *
- * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2006-2009	Johannes Berg <johannes@sipsolutions.net>
  */
 #ifndef __NET_WIRELESS_CORE_H
 #define __NET_WIRELESS_CORE_H
@@ -151,4 +151,8 @@ void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 			struct net_device *dev, bool nowext);
 
+/* internal helpers */
+int cfg80211_validate_key_settings(struct key_params *params, int key_idx,
+				   const u8 *mac_addr);
+
 #endif /* __NET_WIRELESS_CORE_H */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index a39e4644778b..f88dbbec7521 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1,7 +1,7 @@
 /*
  * This is the new netlink-based wireless configuration interface.
  *
- * Copyright 2006, 2007	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2006-2009	Johannes Berg <johannes@sipsolutions.net>
  */
 
 #include <linux/if.h>
@@ -1073,6 +1073,14 @@ static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	err = func(&drv->wiphy, dev, key_idx);
+#ifdef CONFIG_WIRELESS_EXT
+	if (!err) {
+		if (func == drv->ops->set_default_key)
+			dev->ieee80211_ptr->wext.default_key = key_idx;
+		else
+			dev->ieee80211_ptr->wext.default_mgmt_key = key_idx;
+	}
+#endif
 
  out:
 	cfg80211_put_dev(drv);
@@ -1111,45 +1119,9 @@ static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
 	if (info->attrs[NL80211_ATTR_MAC])
 		mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
 
-	if (key_idx > 5)
+	if (cfg80211_validate_key_settings(&params, key_idx, mac_addr))
 		return -EINVAL;
 
-	/*
-	 * Disallow pairwise keys with non-zero index unless it's WEP
-	 * (because current deployments use pairwise WEP keys with
-	 * non-zero indizes but 802.11i clearly specifies to use zero)
-	 */
-	if (mac_addr && key_idx &&
-	    params.cipher != WLAN_CIPHER_SUITE_WEP40 &&
-	    params.cipher != WLAN_CIPHER_SUITE_WEP104)
-		return -EINVAL;
-
-	/* TODO: add definitions for the lengths to linux/ieee80211.h */
-	switch (params.cipher) {
-	case WLAN_CIPHER_SUITE_WEP40:
-		if (params.key_len != 5)
-			return -EINVAL;
-		break;
-	case WLAN_CIPHER_SUITE_TKIP:
-		if (params.key_len != 32)
-			return -EINVAL;
-		break;
-	case WLAN_CIPHER_SUITE_CCMP:
-		if (params.key_len != 16)
-			return -EINVAL;
-		break;
-	case WLAN_CIPHER_SUITE_WEP104:
-		if (params.key_len != 13)
-			return -EINVAL;
-		break;
-	case WLAN_CIPHER_SUITE_AES_CMAC:
-		if (params.key_len != 16)
-			return -EINVAL;
-		break;
-	default:
-		return -EINVAL;
-	}
-
 	rtnl_lock();
 
 	err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
@@ -1210,6 +1182,15 @@ static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info)
 
 	err = drv->ops->del_key(&drv->wiphy, dev, key_idx, mac_addr);
 
+#ifdef CONFIG_WIRELESS_EXT
+	if (!err) {
+		if (key_idx == dev->ieee80211_ptr->wext.default_key)
+			dev->ieee80211_ptr->wext.default_key = -1;
+		else if (key_idx == dev->ieee80211_ptr->wext.default_mgmt_key)
+			dev->ieee80211_ptr->wext.default_mgmt_key = -1;
+	}
+#endif
+
  out:
 	cfg80211_put_dev(drv);
 	dev_put(dev);
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 5f7e997195c7..beb226e78cd7 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -138,3 +138,48 @@ void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 		if (wiphy->bands[band])
 			set_mandatory_flags_band(wiphy->bands[band], band);
 }
+
+int cfg80211_validate_key_settings(struct key_params *params, int key_idx,
+				   const u8 *mac_addr)
+{
+	if (key_idx > 5)
+		return -EINVAL;
+
+	/*
+	 * Disallow pairwise keys with non-zero index unless it's WEP
+	 * (because current deployments use pairwise WEP keys with
+	 * non-zero indizes but 802.11i clearly specifies to use zero)
+	 */
+	if (mac_addr && key_idx &&
+	    params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
+	    params->cipher != WLAN_CIPHER_SUITE_WEP104)
+		return -EINVAL;
+
+	/* TODO: add definitions for the lengths to linux/ieee80211.h */
+	switch (params->cipher) {
+	case WLAN_CIPHER_SUITE_WEP40:
+		if (params->key_len != 5)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_TKIP:
+		if (params->key_len != 32)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_CCMP:
+		if (params->key_len != 16)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_WEP104:
+		if (params->key_len != 13)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_AES_CMAC:
+		if (params->key_len != 16)
+			return -EINVAL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index abf6b0a047d8..ffc98a8d6e5c 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -5,12 +5,13 @@
  * into cfg80211, when that happens all the exports here go away and
  * we directly assign the wireless handlers of wireless interfaces.
  *
- * Copyright 2008	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2008-2009	Johannes Berg <johannes@sipsolutions.net>
  */
 
 #include <linux/wireless.h>
 #include <linux/nl80211.h>
 #include <linux/if_arp.h>
+#include <linux/etherdevice.h>
 #include <net/iw_handler.h>
 #include <net/cfg80211.h>
 #include "core.h"
@@ -477,3 +478,257 @@ int cfg80211_wext_giwretry(struct net_device *dev,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(cfg80211_wext_giwretry);
+
+static int cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
+				   struct net_device *dev, const u8 *addr,
+				   bool remove, bool tx_key, int idx,
+				   struct key_params *params)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	int err;
+
+	if (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
+		if (!rdev->ops->set_default_mgmt_key)
+			return -EOPNOTSUPP;
+
+		if (idx < 4 || idx > 5)
+			return -EINVAL;
+	} else if (idx < 0 || idx > 3)
+		return -EINVAL;
+
+	if (remove) {
+		err = rdev->ops->del_key(&rdev->wiphy, dev, idx, addr);
+		if (!err) {
+			if (idx == wdev->wext.default_key)
+				wdev->wext.default_key = -1;
+			else if (idx == wdev->wext.default_mgmt_key)
+				wdev->wext.default_mgmt_key = -1;
+		}
+		return err;
+	} else {
+		if (addr)
+			tx_key = false;
+
+		if (cfg80211_validate_key_settings(params, idx, addr))
+			return -EINVAL;
+
+		err = rdev->ops->add_key(&rdev->wiphy, dev, idx, addr, params);
+		if (err)
+			return err;
+
+		if (tx_key || (!addr && wdev->wext.default_key == -1)) {
+			err = rdev->ops->set_default_key(&rdev->wiphy,
+							 dev, idx);
+			if (!err)
+				wdev->wext.default_key = idx;
+			return err;
+		}
+
+		if (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC &&
+		    (tx_key || (!addr && wdev->wext.default_mgmt_key == -1))) {
+			err = rdev->ops->set_default_mgmt_key(&rdev->wiphy,
+							      dev, idx);
+			if (!err)
+				wdev->wext.default_mgmt_key = idx;
+			return err;
+		}
+
+		return 0;
+	}
+}
+
+int cfg80211_wext_siwencode(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct iw_point *erq, char *keybuf)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+	int idx, err;
+	bool remove = false;
+	struct key_params params;
+
+	/* no use -- only MFP (set_default_mgmt_key) is optional */
+	if (!rdev->ops->del_key ||
+	    !rdev->ops->add_key ||
+	    !rdev->ops->set_default_key)
+		return -EOPNOTSUPP;
+
+	idx = erq->flags & IW_ENCODE_INDEX;
+	if (idx == 0) {
+		idx = wdev->wext.default_key;
+		if (idx < 0)
+			idx = 0;
+	} else if (idx < 1 || idx > 4)
+		return -EINVAL;
+	else
+		idx--;
+
+	if (erq->flags & IW_ENCODE_DISABLED)
+		remove = true;
+	else if (erq->length == 0) {
+		/* No key data - just set the default TX key index */
+		err = rdev->ops->set_default_key(&rdev->wiphy, dev, idx);
+		if (!err)
+			wdev->wext.default_key = idx;
+		return err;
+	}
+
+	memset(&params, 0, sizeof(params));
+	params.key = keybuf;
+	params.key_len = erq->length;
+	if (erq->length == 5)
+		params.cipher = WLAN_CIPHER_SUITE_WEP40;
+	else if (erq->length == 13)
+		params.cipher = WLAN_CIPHER_SUITE_WEP104;
+	else if (!remove)
+		return -EINVAL;
+
+	return cfg80211_set_encryption(rdev, dev, NULL, remove,
+				       wdev->wext.default_key == -1,
+				       idx, &params);
+}
+EXPORT_SYMBOL_GPL(cfg80211_wext_siwencode);
+
+int cfg80211_wext_siwencodeext(struct net_device *dev,
+			       struct iw_request_info *info,
+			       struct iw_point *erq, char *extra)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+	struct iw_encode_ext *ext = (struct iw_encode_ext *) extra;
+	const u8 *addr;
+	int idx;
+	bool remove = false;
+	struct key_params params;
+	u32 cipher;
+
+	/* no use -- only MFP (set_default_mgmt_key) is optional */
+	if (!rdev->ops->del_key ||
+	    !rdev->ops->add_key ||
+	    !rdev->ops->set_default_key)
+		return -EOPNOTSUPP;
+
+	switch (ext->alg) {
+	case IW_ENCODE_ALG_NONE:
+		remove = true;
+		cipher = 0;
+		break;
+	case IW_ENCODE_ALG_WEP:
+		if (ext->key_len == 5)
+			cipher = WLAN_CIPHER_SUITE_WEP40;
+		else if (ext->key_len == 13)
+			cipher = WLAN_CIPHER_SUITE_WEP104;
+		else
+			return -EINVAL;
+		break;
+	case IW_ENCODE_ALG_TKIP:
+		cipher = WLAN_CIPHER_SUITE_TKIP;
+		break;
+	case IW_ENCODE_ALG_CCMP:
+		cipher = WLAN_CIPHER_SUITE_CCMP;
+		break;
+	case IW_ENCODE_ALG_AES_CMAC:
+		cipher = WLAN_CIPHER_SUITE_AES_CMAC;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	if (erq->flags & IW_ENCODE_DISABLED)
+		remove = true;
+
+	idx = erq->flags & IW_ENCODE_INDEX;
+	if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
+		if (idx < 4 || idx > 5) {
+			idx = wdev->wext.default_mgmt_key;
+			if (idx < 0)
+				return -EINVAL;
+		} else
+			idx--;
+	} else {
+		if (idx < 1 || idx > 4) {
+			idx = wdev->wext.default_key;
+			if (idx < 0)
+				return -EINVAL;
+		} else
+			idx--;
+	}
+
+	addr = ext->addr.sa_data;
+	if (is_broadcast_ether_addr(addr))
+		addr = NULL;
+
+	memset(&params, 0, sizeof(params));
+	params.key = ext->key;
+	params.key_len = ext->key_len;
+	params.cipher = cipher;
+
+	return cfg80211_set_encryption(
+			rdev, dev, addr, remove,
+			ext->ext_flags & IW_ENCODE_EXT_SET_TX_KEY,
+			idx, &params);
+}
+EXPORT_SYMBOL_GPL(cfg80211_wext_siwencodeext);
+
+struct giwencode_cookie {
+	size_t buflen;
+	char *keybuf;
+};
+
+static void giwencode_get_key_cb(void *cookie, struct key_params *params)
+{
+	struct giwencode_cookie *data = cookie;
+
+	if (!params->key) {
+		data->buflen = 0;
+		return;
+	}
+
+	data->buflen = min_t(size_t, data->buflen, params->key_len);
+	memcpy(data->keybuf, params->key, data->buflen);
+}
+
+int cfg80211_wext_giwencode(struct net_device *dev,
+			    struct iw_request_info *info,
+			    struct iw_point *erq, char *keybuf)
+{
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+	int idx, err;
+	struct giwencode_cookie data = {
+		.keybuf = keybuf,
+		.buflen = erq->length,
+	};
+
+	if (!rdev->ops->get_key)
+		return -EOPNOTSUPP;
+
+	idx = erq->flags & IW_ENCODE_INDEX;
+	if (idx == 0) {
+		idx = wdev->wext.default_key;
+		if (idx < 0)
+			idx = 0;
+	} else if (idx < 1 || idx > 4)
+		return -EINVAL;
+	else
+		idx--;
+
+	erq->flags = idx + 1;
+
+	err = rdev->ops->get_key(&rdev->wiphy, dev, idx, NULL, &data,
+				 giwencode_get_key_cb);
+	if (!err) {
+		erq->length = data.buflen;
+		erq->flags |= IW_ENCODE_ENABLED;
+		return 0;
+	}
+
+	if (err == -ENOENT) {
+		erq->flags |= IW_ENCODE_DISABLED;
+		erq->length = 0;
+		return 0;
+	}
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(cfg80211_wext_giwencode);